Well, I just bit the bullet, and purchased a 721 to replace my ailing DP. I also have a 4000. I currently have a Pronto (TSU1000) that I use to program both. I found a workaround for the 4000 power, but not for the DP. Hopefully the discretes above will work for the 721 when I get it next week. Currently, both receivers are on address 1, but have different IR codes, and only the 4000 has UHF. However, since the 721 also has UHF, I have to have different addresses now, so I will probably move my 4000 to address #2, and re-enter all the IR codes for doing that, so I can steal address 1 codes for the 721 if someone has already done that. Are there some CCFs that have the 721 in them posted already?